Driving mechanism for machine-tools.



A. J. GIPFORD.

DRIVING MEGHANISM FOR MACHINE TOOLS.

APPLICATION FILED JAN.18, 19094 I 1,091,569. Patenued Mar.31,1914.

2 SHBBTS-SHBET l.

A. J. GIFFORD. DRIVING MBCHANISM FOR MACHINE TOOLS.

APPLICATION FILED JAN. 1s, 1909.

1,091,569. Patented Mar.31,1914,

2 SHEETS-SHEET 2.

ALBERT J. errronn, or worel COMPANY, or

"WTER, MASSACHUSETTS, ASSIG-NOR TO W. H. LELAND & "1 ORCESTER, IMASSACHUSETTS, A FIRM.

DBIVI'Q; IJLECHANISM FOR MACHINE-TOOLS.

Specification of Letters Patent.

Patented Mar. 31, 1914.

Application led January 1S, 1909. Serial No. $12,821.

` it known that l, Lunar J. Grronn, a

citizen of the United States. residing at llorcester, in the county of i'i'orcester and State of Massachusetts, have invented a new and useful Driving lllechanism for Machine-Tools and the like, of which the following is a specification.

rlhis invention relates to a driving' mecha nisni particularly adapted for sensitive drills, but capablelof general use.

The principal objects of the invention are to provide a simple support for a countershaft having two belts extending in directions at an angle to each other so that the tension on lthe belts will be automatically cqualized; to provide for conveniently adjusting both belts by a s ingle adjustment; to provide means for adjustably supporting the' adjusting' device for the shaft so that the relative tension on the two belts can be changed by means of a single adjustment; to provide means whereby the counter-shaft can be rigidly supported from the frame of the machine and clamped firmly in adjusted positions, so that one of the belts can be shifted without disarranging the adjustment of the other or slacking it; and to pro- ,vide improvements in certain features of construction as `will appear hereinafter.

Reference is to be had to the accompany ing drawings, in which- Figure 1 is a side view of the upper part of a sensitive drill showing a practicable form of the invention applied thereto; and Fig. 2 is a rear elevation of the same showing a set or battery of drills and showing a slight modification.

la the application of this invention to a sensitive drill., the frame. 10 thereof supports the .main power shaft 11 having a cone pulley l2 thereon in the usual way. This power shaft receives power from a. tight and loose pulley 18 as is well understood. The cone pulley 12 is shown as driving a second cone pulley 14: byv means of a belt 15, the cone pulley 1li being mounted on a counter shaft 16 which is provided with belt 18 passing 20, the latter b eing supported in vertical position at the end of the goose-neck.

ln order to rigidly support the counter shaft the frame below the goose-neck is provided with an inclined strut 21, and extendanother pulley 17 driving ing' backwardly from the goose-neck is a bar The strut and bar are connected at then' extremities, preferably integrally, and the): are also prefer.-.blv .integral with the frame and gooseneclt, being cast' in one piece therewith. .\.t :the point of connection of the bar and strut is shown a passage 23 therethrough for a bearing member or block 24s on which the shaft 16 is mounted. This bearing block is provided with a non-rotatable screw Q5 havingv a nut 26 thereon shown as provided with a hand wheel 27. The end of the nut is convex and it rests 1n a concave seat Q8 on the rear of the goose-neck or frame. ln Fig. 1 this seat is adjustable by a screw 29 but in the form shown in 2 it cast integral with the frame. The walls of the passage 23,- constitutestops t'o prevent excessive motion ,of the supporting member Q5 if one. of the belt., particularly the upper one, stretches, breaks or is removed.

"he bearing member or block 24; andconater-shaft 16 can be moved out and in by the screw 25 and can be swung about the pivot at the end ofthe nut Q6. It will be `een therefore that if the line between this pivot and the center of the shaft 16 is located in the angle between the lines connecting the center of the shaft 16 with the center of the shaft 11 and the center of the pulley 19, when the block 2i is free to move,-

the tensions on the two belts will automatically equalize, because the one which is the tighter will tend to pull the shaft 16 toward it, which' will slightly swing the bear- V ing block in that direction until the tensions are equal. A screw 30 is then tightened up so as t0 secure the block 24C and shaft 16 in fixed position, and after that the belt 15 can be shifted on its cones without interfering with the tension of the belt 1S. In addition to this when the seat 2S is adjustable, as shown in Fig. l, this adjustment provides for changing the angle of `he screw 25 so that if under equal tensions the belts will not have equal powers of transmission, the

adjustment can be made so that the automatic equalization will result in giving a slightly greater tension to the belt which has the greater slip as would ordinarily be the case with the quarter turn belt in the illustration presented. In this ,case the equalization of the transmissive powers of -the belts is automatic as explained above,

and the adjustment can be made so that they would both slip at the same time. The bearing block and counter shaft are held so as to have a motion of translation in a plane, and are kept from turning or moving out of this -plane so that'the pulleys on the counter shaft will always be in proper position with respect to the pulleys l2 and 19.

As is usually the ncase in sensitive drills the frame 10 is shown as provided with a bracket 35 adapted to slide up and down and carrying therein a pinion meshing with 'a rack 37 on the quill 38 connected with the spindle 20. In this case the pinion is operated by a rod 46.

While I have illustrated and described a preferred embodiment of the invention and one modiiication, I am aware that many other modifications can be made therein by any person skilled in the art, without departing from the scope of the invention as expressed in the claims, therefore, I do not wish to be limited to all the features of construction shown and described or to the lapf plication of all. features of the invention to drills, but Y What I do claim is, I

1. The combination with a frame, a bar extending substantially horizontally back from the upper part of 'the same, and a strut extending upwardly at an angle from below the same and connected at its upper end with said bar, of a counter shaft, a bear: ing for the counter shaft movably mounted near the connection between the bar and strut and two belts extending from said counter-shaft, one substantially vparallel with the bar and the other with the strut, Vwhereby the pull of the belts will be lengthwise of the bar and strut'respectively.

2. The combination with a frame, a bar extending substantially horizontally back from the upper part of the same, and a strut extending upwardly at an angle from below the same and connected at its upper end with said bar, of a counter shaft, a bearing for the counter shaft movably mounted near the connection between the bar land strut, means for adjusting said bearing toward and from the frame and means on the bar and strut for fastening the bearing in adjusted positions,

3. The combination of a frame,j`a bar eX- tending horizontally from the upper part thereof, and a strut connected with the end of said ybar and with the lower part of the framev said bar and strut havin# a assa ev therethrough at their 'point of connection with each other, of a bearing block movably mounted in said passage,` a counter shaft carried by the bearing block,V and means for tightening said bearing block in adjusted positions in said passage.

4. The combination of a frame, a bar eX tending horizontally from the upper part thereof, a strut connected with the end of said bar and with the lower part of the frame, said bar and strut having a passage therethrough at their point of connection with each other, of abearing bloei; inovably mounted in said passage, a counter shaft carried by the bearing block, means for tightening said bearing block in adjusted positions in said passage,`andmeans supported -by the bearing block and frame for adjusting` the bearing block toward and from the frame, said means being capable of angular adjustment.

The combination of a frame having a socket thereon, provided with a concave bottom, a nut having a convex end projecting into said socket, a screw for the nut, a bearing block connected with said screw, means extending from the frame for adjustably supporting said bearing block, whereby it may be moved toward and from the frame by the screw and nut, and may be moved angularly with the end of said nut as a center, a counter shaft supported by said bearing block, and means for clamping thebearing block in adjusted positions.

6. In a machine tool,the combination with a frame,.of a cone driving pulley, a driven pulley, both of said pulleys being supported by said frame, two connected pulleys supported by said frame, one being; a cone puia ley, a belt extending from the. driving pulley to the cone pulley, abelt extending from the other connected pulley to the driven pulley, means supported by said frame and movable in a plane at right angles to the axes of said .sition whereby the one lof said belts on the cone pulleys can be shifted.-

7. The combination of a frame, a countershaft thereon, twoA shafts on the frame located at a distance from the counter shaft, pulleys on said shafts, two belts, one extending from the counter shaft to ea h of the other shafts, a bearing member supl orting the counter sha-ft, a screw projecting from said bearing member and making an acute angle with both belts, a nut on the screw, and means on said frame between said belts for pivotally supporting the end of the nut, whereby the turning of the nut will adjust. thel bearing member out and in so as to tighten or loosen both belts, and whereby the tighter of the two belts will move the counter shaft toward the tighter belt.

S. The combination of a counter shaft, two shafts located at a distance therefrom., pulleys on said shafts, two belts, one extending from the counter shaft to each of the other shafts, a bearing lmember supporting the counter shaft, a screw projecting from said bearing member and making an angle with both belts, a nut on the screw said nut projecting beyond the screw, a seat having a concave surface for receiving the nut, and means for adjusting said seat so that the angle of the screw relative to the belts can be varied whereby when said bearing member is capable of moving freely about the end of the nut as a. pivot', the tension of the belts will be automatically adjusted.

9. The combination of'. a frame, a bearing member pivotally mounted thereon, a shaft on the bearing member, two shafts adjacent to said frame, on opposite sides of said bearing member, belts connecting the first named shaft, with the other two shafir, said bearing member being located between the belts, means for moving the pivot of' said bearing member along the frame toward or from either belt, whereby the relative tension on the belts can be varied, and means for clamping the bearing member in adjusted positions.

10. The combination of a counter shaft, a pivoted bearing member supporting it, means for adjust-ing the bearing member toward and from its pivot and means for moving -the pivot transversely to the direction of adjustment of the bearing member toward or from either belt, whereby the relative tension on the belts can be varied.

1l. The combination of a counter shaft, a pivoted bearing member supporting it, means for adjusting the bearing member toward and from its pivot, means for adjusting the pivot transversely to the direction of adjustment of the bearing member, means for holding the bearing member in a .position free to swing on its pivot in a plane to permit equalization of belt tension and means for securing the bearing member in fixed position.

12. The combination of a frame having a goose neck, integral means extending outwardly at the rear from the goose neck for sup orting driving connections, a power sha t supported by the frame, a cone pulley on said power shaft, a block movably mounted on said supporting means, a countershaft carriedby said block, a cone pulley on the counter shaft, a second pulley on the counter shaft, a spindle carried at the end of the goose neck and having a pulley thereon, a belt for connecting said cone pulleys, a second belt for connecting the other two pulleys, means-for supporting the counter shaft to move angularly upward and downward whereby the tension' on the two belts will be equalized, and means for securing said counter shaft in fixed position'.

13. The combination with a frame having a goose neck,-a bar extending substantially horizontally back from the up er part of the goose neck, and a strut exten ing upwardly at an angle from below the goose neck and integrally connected at its upper end with said bar, said bar and strut being integral with the frame, of a counter shaft, a bearing for the counter .shaft movably mounted near the connection between the bar and strut, and means for adjusting said bearing.

14. In a machine tool, the combination 'with a frame, a driving pulley on a horizontal axis and a driven pulley on a; vertical axis, both on said fra-me, of an arm pivoted on said frame, a shaft supported on said arm at a distance from its pivot, pulleys on said shaft, belts extending from the last named pulleys to the pulleys on the frame, said ann being located in the angle between said belts, and means for moving the point of pivotal .support of said arm toward or from either belt, whereby the relative tension on the belts can be varied.

The combination with a fra-me, of a driving cone pulley having a horizontal axis, a driven pulley having a vertical axis, both of said pulleys being supported by said frame, two connected pulleys one being a cone pulley, a belt extending from one of the cone pulleys to the other, a belt extending from theother of the connected pulleys to the pulley having the vertical axis, means for constantly supporting said connected pulleys movably in a position from which they willbe caused to move. bodily nearer either the driving or driven pulley and farther from the other when the tensions of the two belts are unequal, and means for securing the connected pulleys in Afixed position so that the belt on the cone pulleys can be shifted. l

In testimony whereof I have hereunto set my hand, in the presence of two subscribing witnesses.

ALBERT J. GIFFORD.

Witnesses:

ALBERT E. FAY, C. Foimns'i' Wasson'. 

